水坝建设对石羊河流域水资源生态环境的影响

在分析大量相关资料的基础上,对20世纪50年代、70年代、80年代、90年代和2008年5个时期的卫星遥感影像数据进行解译,综合研究水坝建设对石羊河流域水资源生态环境的影响。结果表明：由于上游和中游水库的拦截,使下游地表水资源大幅度减少;下游河道径流减少严重,甚至长期断流;下游地下水严重超采,导致地下水位急剧下降;天然植被盖度逐渐降低,植被出现明显退化。

Ecological impact caused by dam construction in Shiyang River Basin

Based on literature data analysis and five stages（50''s, 70''s, 80''s, 90''s and 2008）satellite remote sensing data interpretation, the ecological impact caused by dam construction in Shiyang River Basin was analyzed. The results showed that: Because the dam in upstream and midstream Intercept,the surface water in the downstream reduced significantly . River runoff in the downstream reduced seriously and even long-term drying. groundwater in the downstream over-exploitation,it resulting sharp decline in groundwater levels. Natural vegetation cover was reduced gradually, vegetation degenerated significantly.